Linux Mint 20.3 Cinnamon (Edge) Edition now available for download
When using a Linux-based operating system, you should always use the most recent kernel, right? Actually, no. While new kernels do add fixes and support for new hardware, they can also be less stable and cause bugs.
Unfortunately, if you have extremely new hardware, sometimes you must use a newer kernel in order to boot, as older kernels do not yet support some of your devices. For instance, Linux Mint 20.3 "Una" was released recently and it comes with Linux kernel 5.4. If that older kernel does not support your computer, it may not boot.